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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
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Your heart beats over 36 million times a year.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.